GPT Zero

Overview

GPTZero AI Detector scans documents for potential AI-generated content, providing in-depth results on AI probabilities, vocabulary analysis, and hallucination detection, as well as plagiarism checking and authorship verification capabilities.

From the official site

The World's #1 AI Content Detector with over 17 Million Users

The text above is quoted from this tool’s official website — the vendor’s own words.

Key points from the official site

• The most precise, reliable AI detection results on the market
• Detect plagiarism

The points above are quoted from this tool’s own website sections and feature lists — vendor copy, not our review.

Official FAQ

What is GPTZero?

GPTZero is the first and leading AI detector that allows you to identify specific content in a document or text that has been generated by a large language model (LLM), such as ChatGPT. Founded in January 2023, GPTZero has served over 10 million users to date and works with 100+ organizations in education, hiring, publishing, legal and more.

How does AI detection work?

AI detectors work by looking for patterns in text that are more likely to have been written by a machine than a human. The most common factors they look for include: Perplexity: Is the writing obviously predictable? Burstiness: How much variation is there in the sentence length and style? Style: Is the tone and writing style overly generic or repetitive? GPTZero uses its own proprietary model that

Is GPTZero's AI detector accurate?

Yes. Independent benchmarks, like our partners at Penn State's AI Research Lab, and our own large-scale testing show that GPTZero is the most accurate AI detector, with a 99% accuracy rate when spotting AI-generated text vs. human writing. This means we correctly classify AI writing 99 out of 100 times and keep misclassification of text to an absolute minimum. Our results were further validated on

How do I use GPTZero's AI detection tool?

You can start using GPTZero straight away in 3 easy steps: Paste Text or Upload Document: Paste in raw text or upload your file for review and press 'Scan'. For scans over 10,000 characters, create a free account first. See Your Results: GPTZero will suggest what percentage of your text is likely to be AI-generated and highlight the specific phrases it has detected. Download our Chrome Extension f

Who is GPTZero for?

GPTZero is the most trusted AI content checker in education, both for teachers and students who use GPTZero to guide conversations on academic integrity and writing improvement. GPTZero is used in over 3500 colleges and 100s of institutions. We also serve publishers, recruiters, copy-writers, marketers and businesses where authentic and quality writing truly matters.

Does the GPTZero AI Content Checker only detect ChatGPT outputs?

No. GPTZero works across a wide range of AI language models, including but not limited to ChatGPT, GPT-5, GPT-4, GPT-3, Gemini, Claude, Llama, Deepseek, and AI services based on those models. Our detector is designed for the highest accuracy rate regardless of which model may have produced the text. In our latest model release, we have updated the majority of our training data, including more AI d

These questions and answers come from the tool’s own structured data, not written by us.